EconBiz Author Profile

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Years of publications: 2005 - 2025

33 records from EconBiz based on author Name

1. Disagreement about Evidence-Based Policy

abstract

Evidence based-policy (EBP) is a popular research paradigm in the applied social sciences and within government agencies. Informally, EBP represents an explicit commitment to applying scientific methods to public affairs, in contrast to ideologically-driven or merely intuitive “common-sense” approaches to public policy. More specifically, the EBP paradigm places great weight on the results of experimental research designs, especially randomised controlled trials (RCTs), and systematic literature reviews that place evidential weight on experimental results. One hope is that such research designs and approaches to analysing the scientific literature are sufficiently robust that they can settle what really ‘works’ in public policy. Can EBP succeed in displacing reliance on domain-specific expertise? On our account, this is seldom, if ever, the case. The key reason for this is that underlying this approach is generally an appeal to argument by induction, which always requires further assumptions to underwrite its validity, and if not induction, some other argument form that also requires assumptions that are very often not validated for the case at hand

Cowen, Nick; Cartwright, Nancy;
2022
Availability: Link

2. A philosopher looks at science

abstract

What is science and what can it do? Nancy Cartwright here takes issue with three common images of science: that it amounts to the combination of theory and experiment; that all science is basically reducible to physics; and that science and the natural world which it pictures are deterministic. The author's innovative and thoughtful book draws on examples from the physical, life, and social sciences alike, and focuses on all the products of science - not just experiments or theories - and how they work together. She reveals just what it is that makes science ultimately reliable, and how this reliability is nevertheless still compatible with a view of nature as more responsive to human change than we might think. Her book is a call for greater intellectual humility by and within scientific institutions. It will have strong appeal to anyone who thinks about science and how it is practised in society.

Cartwright, Nancy;
2022
Availability: Link
Citations: 1 (based on OpenCitations)

3. Understanding and misunderstanding randomized controlled trials

Deaton, Angus; Cartwright, Nancy;
2016
Type: Arbeitspapier; Working Paper; Graue Literatur; Non-commercial literature;
Availability: Link

4. Understanding and Misunderstanding Randomized Controlled Trials

abstract

RCTs would be more useful if there were more realistic expectations of them and if their pitfalls were better recognized. For example, and contrary to many claims in the applied literature, randomization does not equalize everything but the treatment across treatments and controls, it does not automatically deliver a precise estimate of the average treatment effect (ATE), and it does not relieve us of the need to think about (observed or unobserved) confounders. Estimates apply to the trial sample only, sometimes a convenience sample, and usually selected; justification is required to extend them to other groups, including any population to which the trial sample belongs. Demanding "external validity" is unhelpful because it expects too much of an RCT while undervaluing its contribution. Statistical inference on ATEs involves hazards that are not always recognized. RCTs do indeed require minimal assumptions and can operate with little prior knowledge. This is an advantage when persuading distrustful audiences, but it is a disadvantage for cumulative scientific progress, where prior knowledge should be built upon and not discarded. RCTs can play a role in building scientific knowledge and useful predictions but they can only do so as part of a cumulative program, combining with other methods, including conceptual and theoretical development, to discover not "what works," but "why things work"

Deaton, Angus; Cartwright, Nancy;
2016
Availability: Link Link
Citations: 72 (based on OpenCitations)

5. Street-Level Theories of Change : Adapting the Medical Model of Evidence-Based Practice for Policing

abstract

Evidence-based medicine (EBM), with its evidence hierarchies and emphasis on RCTs, meta-analyses and systematic reviews, sets the model for evidence-based policy almost everywhere, policing no exception. But how closely should policing follow this model? We argue that RCTs can tell you little about what you need to know for real-world practice: will this policy work where and when you implement it? Defending that it will do so takes good theory. For RCTs to play a role in theory development, they must be set into a larger body of knowledge, including local knowledge about the sites of implementation. Unfortunately the standard EBM model generally ignores the other kinds of knowledge needed. An alternative model for evidence-based policing, similar to that of the new movement for ‘EBM+’ and immanent in the practice of realist synthesis, focuses on the arguments that proposed policing policies will work where and when they are implemented and looks for the evidence needed to support those arguments

Cowen, Nick; Cartwright, Nancy;
2019
Availability: Link Link
Citations: 2 (based on OpenCitations)

6. Randomized Controlled Trials : How Can We Know 'What Works'?

abstract

We attempt to map the limits of evidence-based policy through an interactive theoretical critique and empirical case-study. We outline the emergence of an experimental turn in EBP among British policymakers and the limited, broadly inductive, epistemic approach that underlies it. We see whether and how field professionals identify and react to these limitations through a case study of teaching professionals subject to a push to integrate research evidence into their practice. Results suggest that many of the challenges of establishing evidential warrant that EBP is supposed to streamline re-appear at the level of choice of locally effective policies and implementation

Cowen, Nick; Virk, Baljinder; Mascarenhas-Keyes, Stella; Cartwright, Nancy;
2018
Availability: Link

7. Understanding and Misunderstanding Randomized Controlled Trials

abstract

RCTs would be more useful if there were more realistic expectations of them and if their pitfalls were better recognized. For example, and contrary to many claims in the applied literature, randomization does not equalize everything but the treatment across treatments and controls, it does not automatically deliver a precise estimate of the average treatment effect (ATE), and it does not relieve us of the need to think about (observed or unobserved) confounders. Estimates apply to the trial sample only, sometimes a convenience sample, and usually selected; justification is required to extend them to other groups, including any population to which the trial sample belongs. Demanding “external validity” is unhelpful because it expects too much of an RCT while undervaluing its contribution. Statistical inference on ATEs involves hazards that are not always recognized. RCTs do indeed require minimal assumptions and can operate with little prior knowledge. This is an advantage when persuading distrustful audiences, but it is a disadvantage for cumulative scientific progress, where prior knowledge should be built upon and not discarded. RCTs can play a role in building scientific knowledge and useful predictions but they can only do so as part of a cumulative program, combining with other methods, including conceptual and theoretical development, to discover not “what works,” but “why things work”

Deaton, Angus; Cartwright, Nancy;
2016
Availability: Link